【作者】 吴红举；

【导师】 沈建华；

【作者基本信息】 华东师范大学 ， 计算机应用， 2006， 硕士

【摘要】 分布式图像采集系统在交通、工业监控、军事、医疗、社区安防等领域有着广泛的应用，对于节省人力资源、提高工作效率、增强远程可操作性、提升社区安全等发挥着极大的促进作用，正日益融入人们的生活，也得到人们更多的关注。分布式图像采集系统的具体实现方案多种多样，对这些不同的实现方案进行研究与分析，对于设计性价比高、切合具体应用的分布式图像采集系统具有重要参考价值和意义，这也是本文研究的主要内容。 分布式图像采集系统主要包括3个重要的模块：图像采集与压缩、图像存储、图像传输。本文首先研究基于硬件JPEG编码芯片的图像采集方案，结合2种具体的硬件采集方案对设计、开发进行说明。然后，论文对采用软件JPEG编码的图像压缩方案进行研究，详细介绍了如何在基于ARM7TDMI-S核的平台上实现JPEG算法的优化，讨论了FDCT、除法、定点化等问题，并对图像采集系统中图像质量控制这一个实际的问题进行了研究与分析。接下来，论文对分布式图像采集系统中的传输技术及文件存储进行了讨论，介绍了当前主要的传输技术和图像存储在系统中的设计与实现。 论文的最后部分设计、实现了一个用于高压输电检测的分布式图像采集系统，通过这个具体的实例对论文研究内容进行验证。 论文主要成果： 1．对分布式图像采集系统的结构、方案进行研究，给出了性能测试数据，在一定程度上可以为分布式图像采集系统的设计提供参考。 2．设计、实现精简的CANopen协议，对于相关设计具有一定的借鉴价值。 3．实现一个分布式图像采集系统的应用。更多还原

【Abstract】 Distributed image-collecting system has been widely used in many fields, such as traffic management, industry, military, medical monitoring, home security etc. As we can see, distributed image-collecting system has merged into our daily lives, it reduces waste of human resource, improves our work efficiency, enhances our power of controlling remote devices, and makes our society more safe. Research on various solutions of distributed image collecting system, which is this thesis’ main task, deserves special attention and is of great significance to design distributed image-collecting systems that are most suitable for applications.Image capture and compression, file system, and transport are three important components of distributed image-collecting system. Capture and compression module based on JPEG chip is introduced first, and it discusses how to design, implement image-collecting system using an image sensor and a JPEG encoding chip. Then, the dissertation introduces how to implement an optimized JPEG algorithm on ARM7TDMI-S, which is a popular CPU core. FDCT, division, fix-point processing and control of image quality are discussed in this part. Technical problems about transport and storage of image are investigated, and a general description on how to implement CANopen and NFFS are given here. At last, a distributed image-collecting system, which is used to detect the high voltage wires in electricity transmission, is designed and implemented to confirm viewpoints of the dissertation.The main contribution of this dissertation can be concluded as following:1. Research on architecture and solutions of distributed image-collecting system have been done, and results of testing can be referred in relative researches.2. Implement of reduced CANopen is useful for similar design in a way.3. A distributed image-collecting system that used to detect high voltage wires has been implemented.更多还原